Anaerobic paste compositions
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examples 1
Sealant Formulations
[0056]
TABLE 1High Low ViscosityViscositySample 1Sample 2ComponentCompound(wt %)(wt %)ResinPolyethylene glycol22.52511dimethacrylatePlasticizerTetraethyleneglycol dioctanoate522.525Tricresylphosphate711RheologySynthetic mica fillers1010modifierCetyl alcohol33Propylated bisphenol A fumerate2010Graphite77Polyethylene powder1010Teflon88Cure agents:Cumene hydroperoxide11initiatorSaccharine22acceleratorsN,N-diethyl-p-toluidine0.40.4stabilizerN,N-dimethyl-p-toluidine0.0750.075chelatorNaphthoquinone premix0.80.8EDTA1.61.6AdditivesTitanium dioxide1.61.6
[0057]Anaerobic Samples 1 and 2 were prepared by combining all of the components in in an Air Mixer with stainless steel Cowles / Sawblade impeller for 3 hours at room temperature. The mixed Samples were stored at 4° C. Sample 1 is high viscosity sealant and Sample 2 is low viscosity sealant.
example 2
d and Break Torque
[0058]The cure speed of the above samples was measured against break torque. Break torque was measured in accordance with ASTM D 5649, titled, “Torque Strength of Adhesives used on Threaded Fasteners.” Break torque strength was tested on ⅜″×24″ steel grade 2 nut and bolt assembly. For comparison, SEALLUBE (both high viscosity and low viscosity sealants), available from Henkel Corporation, was also measured and reported in Table 2 and FIG. 7. Samples 1 and 2 cure earlier and faster than SealLubes at both high and low viscosities on steel.
TABLE 2Break Torque at 22° C.High Viscosity (Nm)Low Viscosity (Nm)(hour)SEALLUBESample 1SEALLUBESample 21—0.9—2—3.3—4—4.5—60.025.0—0.7240.36.3—2.2482.66.90.12.61685.88.70.52.8
[0059]Break torques on passive metal substrates were also tested on ⅜″×16″ stainless steel nuts and bolts, and the results are shown in Table 3 and FIG. 8. Samples 1 and 2 cure earlier and faster than SEALLUBES at both high and low viscosities on stainless stee...
example 3
aration Analysis
[0061]FIG. 1 is a photograph of two low-viscosity anaerobic pastes, after they were subjected to room temperature for over three weeks. Control Sample A paste, comprised of natural mica with cetyl alcohol, separated into clear pool of liquid on top of a dark paste. The clear pool was evaluated with IR and TD / GC / MS, and the results are shown in Table 4. Sample B paste in FIG. 1 is has the same components as Control Sample A but made with synthetic mica instead of natural mica.
TABLE 4IRTD / GC / MSPlasticizerPlasticizerNon-filler rheology modifiersNon-filler rheology modifiersCuring agent (decomposed)
[0062]The IR and TD / GC / MS showed that the separated liquid contained plasticizers, decomposed curing agents and non-filler rheology modifiers. Without being bound to any specific theory, phase separations of the paste contribute to inconsistent and delayed curing of the paste.
[0063]Sample 2, a low-viscosity anaerobic paste composition, in FIG. 1 did not separate over three wee...
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